Enjo Kosai (compensated dating) is nothing new, and if you go to Shibuya, even now there are girls who comes and asks you for your "support" (literally translates to Enjo). There's a market for it as seen on this movie, and it has become easy way for high school girls to gain money.
Four girls are friends at school. Each has reason to go on Enjo Kosai. Hiromi is new to all this, but she first starts with going to karaoke house with middle aged man with her friends. Gradually, she starts to do it on her own. Her parents of course knows nothing about this. Hiromi has a goal of making enough money to buy an expensive ring she saw. She thinks its not so difficult, and gets dating appointments over phone. But reality of life is about to give her a lesson.
This type of activity is very easy in Japan where there are many karaoke booth, and so called love hotels. It's easy to get lost in the crowd and blend in as not to be conspicuous. All the girls take full advantage of the society they live in. But such activities are not without risk, and that seems to be the point if there's any about this movie.
Movies about prostitution has been made before and this is another modern take on it. The movie provides inside look of Japanese society, and is an interesting story to watch.
